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Linear guide device

a guide device and linear technology, applied in the direction of linear bearings, shafts and bearings, bearings, etc., can solve the problems of difficult manufacturing of such spacers, difficulty in improving the operability of devices, and infrequent improvement of operability, so as to improve the operability and noise reduction of devices, and achieve easy and reliably realization. , the effect of improving the operability and noise reduction

Inactive Publication Date: 2005-03-22
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Accordingly, an object of the present invention is to provide a linear guide device which secures a smooth revolving motion of rolling elements and improves the device operability without causing the zig-zag phenomenon of the rolling elements and a great variation of dynamic frictional forces.
In addition to this, it is also an object of present invention to solve the above-mentioned problem in the conventional linear guide device. That is, an object of the present invention is to provide a linear guide device with improvements of the device operability and noise reduction which are easily and reliably realized at low cost.

Problems solved by technology

This makes it difficult to improve the operability of the device.
This is one of problems in the conventional linear guide device.
Manufacturing such a spacer is difficult.
Since one or a plurality of spacers thus specified are used, the improvement of the operability is not satisfactory frequently.
When the raceway length variation is beyond an adjusting ability of the spacer, an excessive compression force acts on the rolling element train.
As a result, the operability is considerably deteriorated, a harsh grating noise is generated.
This is the other of problems in the conventional linear guide device.

Method used

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Experimental program
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Effect test

first embodiment

The first embodiment will be described in more detail.

FIG. 5 is a graph showing a relation between D (=(dx2−dx1) / dx1) and the i-th position on an n-divided (n=50) distance corresponding to a ball element movement of a rolling element-to-rolling element span. In other words, the graph shows a variation of D when the steel balls B move by one phase. In the figure, a difference between a maximum value Dmax of a D value and a minimum value Dmin of the same is defined as a rate of change.

FIG. 6 is a graph showing a variation of a rate of change (=Dmax−Dmin) when a raceway length L1 (see FIG. 2) of the raceway defined between the rolling element rolling grooves 3, 31 is varied a distance (=5.4 mm in the embodiment) corresponding to the rolling element-to-rolling element span (1 phase). As seen from FIG. 6, the rate of change becomes extremely large at a point A, and extremely small at a point B. The change rate takes its profile of FIG. 6 every time the raceway length L1 changes by a dist...

second embodiment

A linear guide device which is the present invention will be described with reference to FIGS. 9 through 11. In the linear guide device, the operability is improved such that the change rate (Dmax−Dmin) is selected to be within a range from 0 to 0.425.

FIGS. 9A and 9B are graphs showing the results of measuring a variation of a frictional force when the rate of change is varied. Specifically, the dynamic frictional force is measured at four different change rate values (0.25, 0.35, 0.45, 0.55). FIG. 10 is a graph showing the result of measuring a variation of a frictional force on a conventional product. FIG. 11 is a graph showing a variation profile of a ratio e / es of stickiness at the four change rate values shown in FIGS. 9A and 9B. Here, e represents one of the stickiness of the invention device, and es is the stickiness of the conventional product.

As seen from FIG. 11, the operability of the invention device is improved over the conventional device at 0.425 or smaller in a regio...

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PUM

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Abstract

Disclosed is a linear guide device in which a rate of change expressed as “Dmax−Dmin”, becomes extremely small where Dmax and Dmin are respectively a local maximum and a local minimum of D, expressed as (dx2−dx1) / dx, which is produced when a steel ball B moves a distance corresponding to a rolling element-to-rolling element span, dx1 is a minute movement quantity of a steel ball B when it moves from one space defined between rolling element rolling grooves 3 and 31 of an element endless circulating raceway 7, to one of curved element circulating R parts 6, and dx2 is a minute movement quantity of another steel ball B when it moves from the other curved element circulating R part 6 to the space while the former steel ball is moved by the minute movement quantity dx1.

Description

BACKGROUND OF THE INVENTIONThe present invention relates to a linear guide device, and particularly a linear guide device in use for industrial machines and the like.Further, the present invention also relates to a linear guide device including a slider in which spacers are each interposed between the rolling elements adjacent to each other in the circulating direction.A conventional linear guide device of this type, as shown in FIG. 1, is provided with an axially extending guide rail 1 and a slider 2 slidably mounted on the guide rail 1.Element rolling grooves 3, while linearly and axially extend, are formed on both sides of the guide rail 1. Element rolling grooves 31, which linearly extend (see FIG. 2), are formed in the inner side walls of sleeve parts 4 of a slider body 2A of the slider 2 in a state that the rolling element rolling grooves face the rolling element rolling grooves 3.A number of steel balls B as rolling elements are rollably in a space defined between the rolling...

Claims

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Application Information

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IPC IPC(8): F16C29/06F16C19/02F16C19/20F16C33/37
CPCF16C19/20F16C33/3706F16C29/0642F16C29/0609
Inventor YAMAGUCHI, HIROKISATO, RYOICHIKASUGA, SHINICHIKANO, KENJIKATO, SOICHIROFUJIMURA, NOBUAKI
Owner NSK LTD